If a new "wifi connected" event comes in while a previous one is still
being processed, then cancel the current one as soon as possible. This
prevents the events from being processed in an interleaved manner, causing
chaos and crashes. Hopefully this will fix the jmdns crashes, since that
is triggered by onPostExecute() via FDroidApp.restartLocalRepoService().
java.lang.IllegalStateException: A service information can only be registered with a single instamce of JmDNS.
at javax.jmdns.impl.JmDNSImpl.registerService(JmDNSImpl.java:1005)
at org.fdroid.fdroid.localrepo.LocalRepoService$5.run(LocalRepoService.java:239)
at java.lang.Thread.run(Thread.java:856)
91e06b8496